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I used Minisport roller rockers bought cheap in the 2008-9 crash. I no longer
remember, but they probably are 1.5 (red), and I also used a "warm" Elgin cam
that came in a box of parts.
Where higher ratio rockers are to be used, the required valve clearance can
then be assessed using this simple formula. For instance when using 1.5
rockers, you obviously need to multiply the cam/follower clearance by 1.5. So
0.010-in x 1.5 gives 0.015-in for standard/mild cams and 0.012-in x 1.5 gives
0.018-in for race/more-modified cams. Interestingly, most re-profiled
performance cams generally have a suggested valve clearance of 0.016-in with
standard ratio rockers. To assess required valve clearance where higher ratio
rockers are used simply work it backwards and multiply by the higher ratio.
This works out as 0.016-in divided by 1.25 = 0.0128, then x 1.5 = 0.0192" - or
0.019" at the valve.
----- Original Message -----
From: Michael MacLean
To: Rick Fisk ; Michael Rowe
Cc: Spridgets
Sent: Saturday, October 31, 2015 4:49 PM
Subject: Re: [Spridgets] rocker clearance
How about when you have 1.5 rocker arms? Drove the Bugeye around yesterday.
Runs great, still blue smoke on acceleration on a recent rebuild. At leat 1000
miles since rebuild. I'm afraid the rings never seated properly. Not sure of
the cylinder wall surface during the rebuild as I did not so that part of it.
Mike MacLean
On Saturday, October 31, 2015 1:26 PM, Rick Fisk via Spridgets
<spridgets@autox.team.net> wrote:
The 0.029 in. spec is a whole different thing used when you are assembling
the engine. If your engine is together and you just want to set the valve
clearance it should be 0.012 in. set cold.
Sent from my keyboard
On Oct 31, 2015, at 4:06 PM, Michael Rowe via Spridgets
<spridgets@autox.team.net> wrote:
New 1275 engine.
Haynes says "Rocker clearance, timing only = 0.029 in.
My mechanic/tutor says, "that is twice what it should be."
Bentley says:
Rocker clearance: Running (Standard) = 0.012 in. cold
Running (competition work) = 0.015 in.
timing = 0.029 in.
Online sites agree on = .012 in. cold.
So what is the 0.029 in. for?
Michael Rowe
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=EF=BB=BF<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Dutf-8" http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 9.00.8112.16708"></HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial>I used Minisport roller rockers bought =
cheap in the=20
2008-9 crash. I no longer remember, but they probably are 1.5=20
(red), and I also used a "warm" Elgin cam that came in a box =
of=20
parts.</FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><SPAN>Where <A=20
href=3D"http://www.spridgetmania.com/part/C-AHT436/Roller-Tipped-15-Ratio=
-Rockers-Aluminum">higher=20
ratio rockers</A> are to be used, the required valve clearance can =
then be=20
assessed using this simple formula. For instance when using 1.5 rockers, =
you=20
obviously need to multiply the cam/follower clearance by 1.5. So =
0.010-in x 1.5=20
gives 0.015-in for standard/mild cams and 0.012-in x 1.5 gives 0.018-in =
for=20
race/more-modified cams. Interestingly, most re-profiled performance =
cams=20
generally have a suggested valve clearance of 0.016-in with standard =
ratio=20
rockers. To assess required valve clearance where higher ratio rockers =
are used=20
simply work it backwards and multiply by the higher ratio. This works =
out as=20
0.016-in divided by 1.25 =3D 0.0128, then x 1.5 =3D 0.0192" - or 0.019" =
at the=20
valve.</SPAN></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
<A title=3Drrengineer.mike@att.net =
href=3D"mailto:rrengineer.mike@att.net";>Michael=20
MacLean</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Drefisk@chartermi.net=20
href=3D"mailto:refisk@chartermi.net";>Rick Fisk</A> ; <A=20
title=3Dmdrowe@optonline.net =
href=3D"mailto:mdrowe@optonline.net";>Michael Rowe</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A =
title=3Dspridgets@autox.team.net=20
href=3D"mailto:spridgets@autox.team.net";>Spridgets</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, October 31, =
2015 4:49=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [Spridgets] rocker =
clearance</DIV>
<DIV><BR></DIV>
<DIV=20
style=3D"BACKGROUND-COLOR: #fff; FONT-FAMILY: times new roman, new =
york, times, serif; COLOR: #000; FONT-SIZE: 16px">
<DIV id=3Dyui_3_16_0_1_1446323015003_17729>How about when you have 1.5 =
rocker=20
arms? Drove the Bugeye around yesterday. Runs great, still =
blue=20
smoke on acceleration on a recent rebuild. At leat 1000 miles =
since=20
rebuild. I'm afraid the rings never seated properly. Not =
sure of=20
the cylinder wall surface during the rebuild as I did not so that part =
of=20
it.<BR></DIV>
<DIV dir=3Dltr id=3Dyui_3_16_0_1_1446323015003_17730>Mike =
MacLean<BR></DIV>
<DIV id=3Dyui_3_16_0_1_1446323015003_17731><SPAN></SPAN></DIV><BR>
<DIV class=3DqtdSeparateBR><BR><BR></DIV>
<DIV style=3D"DISPLAY: block" class=3Dyahoo_quoted>
<DIV=20
style=3D"FONT-FAMILY: times new roman, new york, times, serif; =
FONT-SIZE: 16px">
<DIV=20
style=3D"FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, =
Lucida Grande, sans-serif; FONT-SIZE: 16px">
<DIV dir=3Dltr><FONT size=3D2 face=3DArial>On Saturday, October 31, =
2015 1:26 PM,=20
Rick Fisk via Spridgets <<A=20
=
href=3D"mailto:spridgets@autox.team.net";>spridgets@autox.team.net</A>>=
=20
wrote:<BR></FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: rgb(16,16,255) 2px solid; MARGIN-TOP: 5px; =
PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><BR><BR>
<DIV class=3Dy_msg_container>
<DIV id=3Dyiv3068736433>
<DIV>
<DIV>The 0.029 in. spec is a whole different thing used when you are =
assembling the engine. If your engine is together and you just =
want to=20
set the valve clearance it should be 0.012 in. set cold.<BR =
clear=3Dnone><BR=20
clear=3Dnone>Sent from my keyboard</DIV>
<DIV id=3Dyiv3068736433yqt61360 class=3Dyiv3068736433yqt3461902488>
<DIV><BR clear=3Dnone>On Oct 31, 2015, at 4:06 PM, Michael Rowe via =
Spridgets=20
<<A href=3D"mailto:spridgets@autox.team.net"; shape=3Drect =
rel=3Dnofollow=20
target=3D_blank=20
=
ymailto=3D"mailto:spridgets@autox.team.net";>spridgets@autox.team.net</A>&=
gt;=20
wrote:<BR clear=3Dnone><BR clear=3Dnone></DIV>
<BLOCKQUOTE type=3D"cite">
<DIV></DIV></BLOCKQUOTE></DIV></DIV>
<DIV id=3Dyiv3068736433yqt64797 class=3Dyiv3068736433yqt3461902488>
<STYLE></STYLE>
</DIV>
<DIV>
<DIV id=3Dyiv3068736433yqt61805 class=3Dyiv3068736433yqt3461902488>
<DIV><FONT face=3DArial>New 1275 engine.</FONT></DIV>
<DIV><FONT face=3DArial>Haynes says "Rocker clearance, timing only=20
=3D 0.029 in.</FONT></DIV>
<DIV><FONT face=3DArial>My mechanic/tutor says, "that is twice what =
it should=20
be."</FONT></DIV>
<DIV><FONT face=3DArial>Bentley says:</FONT></DIV>
<DIV><FONT face=3DArial>Rocker clearance: Running (Standard) =3D =
0.012 in.=20
cold</FONT></DIV>
<DIV><FONT face=3DArial> =20
=
=20
Running (competition work) =3D =
0.015=20
in.</FONT></DIV>
<DIV><FONT=20
=
face=3DArial> =
&=
nbsp; =20
timing =3D 0.029 =
in.</FONT></DIV>
<DIV><FONT face=3DArial>Online sites agree on =3D .012 =
in.=20
cold.</FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial>So what is the 0.029 in. for?</FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial>Michael Rowe</FONT></DIV></DIV>
<BLOCKQUOTE type=3D"cite">
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